<template>
  <div class="score-case">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length > 0">
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.subject }}</td>
            <td :class="{ red: item.score < 60 }">{{ item.score }}</td>
            <td>{{ item.date }}</td>
            <!-- 不要用索引,因为真正的项目删除是ajax,id值 -->
            <td><a href="#" @click.prevent="remove(item.id)">删除</a></td>
          </tr>
        </tbody>
        <tbody v-else>
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody>
        <tfoot v-if="list.length > 0">
          <tr>
            <td colspan="5">
              <span>总分：321</span>
              <span style="margin-left: 50px">平均分：80.25</span>
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
    <div class="form">
      <div class="form-item">
        <div class="label">科目：</div>
        <div class="input">
          <!-- 只要是表单控件用v-model  -->
          <input type="text" placeholder="请输入科目" v-model="subject" />
        </div>
      </div>
      <div class="form-item">
        <div class="label">分数：</div>
        <div class="input">
          <input type="text" placeholder="请输入分数" v-model="score" />
        </div>
      </div>
      <div class="form-item">
        <div class="label"></div>
        <div class="input">
          <button class="submit" @click="add">添加</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// 写错位置
export default {
  name: "ScoreCase",
  data() {
    return {
      list: [
        {
          id: 15,
          subject: "语文",
          score: 89,
          date: new Date("2022/06/07 10:00:00"),
        },
        {
          id: 27,
          subject: "数学",
          score: 100,
          date: new Date("2022/06/07 15:00:00"),
        },
        {
          id: 32,
          subject: "英语",
          score: 56,
          date: new Date("2022/06/08 10:00:00"),
        },
        {
          id: 41,
          subject: "物理",
          score: 76,
          date: new Date("2022/06/08 10:00:00"),
        },
      ],
      subject: "",
      score: "",
    };
  },
  methods: {
    remove(id) {
      console.log(id);
      // findIndex比indexOf要好 indexOf只能用于基本数据类型
      // 根据id找索引
      // every,some,reduce,findIndex,find,filter,map
      const index = this.list.findIndex((item) => item.id === id);
      this.list.splice(index, 1);
    },
    add() {
      // 数据驱动
      //如果数组中有数据,我们就让最新添加的对象的id值是最后一项的id基础上加1,如果数组是空的,就直接让id就是1
      //slice返回值哪怕是只有一个数据,也是数组
      const id = this.list.length ? this.list.slice(-1)[0].id + 1 : 1;
      const obj = {
        id,
        subject: this.subject,
        score: this.score,
        date: new Date(),
      };
      this.list.push(obj);
    },
  },
};
</script>

<style lang="less">
.score-case {
  width: 1000px;
  margin: 50px auto;
  display: flex;
  .table {
    flex: 4;
    table {
      width: 100%;
      border-spacing: 0;
      border-top: 1px solid #ccc;
      border-left: 1px solid #ccc;
      th {
        background: #f5f5f5;
      }
      tr:hover td {
        background: #f5f5f5;
      }
      td,
      th {
        border-bottom: 1px solid #ccc;
        border-right: 1px solid #ccc;
        text-align: center;
        padding: 10px;
        &.red {
          color: red;
        }
      }
    }
    .none {
      height: 100px;
      line-height: 100px;
      color: #999;
    }
  }
  .form {
    flex: 1;
    padding: 20px;
    .form-item {
      display: flex;
      margin-bottom: 20px;
      align-items: center;
    }
    .form-item .label {
      width: 60px;
      text-align: right;
      font-size: 14px;
    }
    .form-item .input {
      flex: 1;
    }
    .form-item input,
    .form-item select {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      width: 200px;
      height: 40px;
      box-sizing: border-box;
      padding: 10px;
      color: #666;
    }
    .form-item input::placeholder {
      color: #666;
    }
    .form-item .cancel,
    .form-item .submit {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      border-radius: 4px;
      padding: 4px 10px;
      margin-right: 10px;
      font-size: 12px;
      background: #ccc;
    }
    .form-item .submit {
      border-color: #069;
      background: #069;
      color: #fff;
    }
  }
}
</style>
